# Relationship history for MSHA mine 0404636

Current hierarchy: **Harms Michael H → C E M Mining → Rattlesnake Creek**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** C E M Mining → Rattlesnake Creek; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harms Michael H Et Al → Rattlesnake Creek; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harms Michael H Et Al → C E M Mining; 1983-04-01 to current/open; source msha-controller-operator-history